Sofa



FIG. 1 is a front perspective view of a sofa according to my new design;

FIG. 2 is a left front perspective view thereof, being a mirror image of a right front perspective view;

FIG. 3 is a left rear perspective thereof, being a mirror image of a right rear perspective view; and,

FIG. 4 is a rear elevational view.

The bottom is flat and unornamented, except for the legs. 

The ornamental design for a sofa, as shown and described. 